Locomotive valve



Oct. 9, 1934.

P. PASCALE LOCOMOTIVE VALVE Filed Feb. 20, 1931 Patented Oct. 9, 1934 M UNITED STATE PATENT Price LOCOMOTIVE VALVE Pasquale Pascale, New York, N. Y., assignor to Dri-Steam Valve Corporation, New York, N. Y., a corporation of Delaware Application February 20, 1931, Serial No. 517,345

2 Claims. (Cl. 277-37) This invention relates to improvements inlocohead 5, bolted to the top of the standpipe 1 by motive valves, and has special reference to a steam bolts 6. f drying balanced throttle valve of the type shown The standpipe is provided with an annular Aand described in my co-pending application Serial liange 6 at its top to which the upper end of a l l Number 498,441 filed November 26,1930. y turbine casing 7 is bolted by means of bolts 8.

The Valve about to be described is similar in the The standpipe is further provided with a more main to the valve described and illustrated in the extensive annular flange 9 below the flange 6, pending application just mentioned. However, to which is bolted, by bolts 10, the lower end of I in the present instance, the balancing characterthe turbine casing 7. Still another ange 10 Y 10 istics of the valve are augmented and improved is provided on the standpipe to which is bolted, in that with the construction hereinafter deby bolts l1, the steam drying sleeve 12, provided scribed, the possibility of perfect balance, or such with numerous small perforations or nozzles 13, balance as is predetermined upon, is obtained unjust like those provided in similar sleeves or cylder all conditions likely to arise in the operation inders lwhich form `characteristic portions of the I "71'5 of valves of this character. More specifically valve illustrated in the pending application, as 70 stated, the object of the invention is to provide well as those valves which are illustrated in patthe valve proper with means cooperating with, or ents already issued to me. The lower end of this which may cooperatev with the main balancing sleeve is seated upon a narrow annular shoulder means, to insure, automatically the establishment 14, provided upon the standpipe just above the y' 1n'20 of equilibrium ofthe main valve, and still more larger annular flange 9. The standpipe in that 75 specically'stated,the'invention comprehends the portion thereof, opposite the perforated sleeve, provision of an adequate number of check valves is provided with a number of ports 15, through arranged in the head of the main valve, so that which the steam enters the dry-pipe after passif the pressure exerted underneath the head of ing through the turbine casing and through the 72'5 the main valve is greater than the pressure on perforated cylinder or sleeve. 80

the top of the head, or vice versa, the check valves The main valve 2 comprises in the main, the will be automatically opened by such excessive head 4, and skirt 16, the lower edge of theskirt pressure to establish the equilibrium mentioned. being beveled as` indicated at 17 and adapted to In the drawing illustrating the inventionseat upon a similarly shaped valve seat 18 formed 30 Figure 1 is avertical'diametrical section through at the lower inner edge of the ports 15 and just -85 the valve. within the same. The valve is formed with a Figure 2 is a plan view of the valve with the central boss 19, in which is threaded a pilot upper structure thereof Vsufficiently broken away valve cage 19' chambered out in its lower po-rto show the arrangementof the check valves in tion to form a chamber 20, of a little larger t I- 35 the valve head around the central pilot valve in diameter than the cylindrical opening 21 that is 90 the head of the'main valve. in the upper part of said cage. In the lower Since the invention aboutfto be described repart of the cage is provided a series of ribs 22 sides in the addition of the check valves, in comfor a purpose that will presently be described. bination with the valve as illustrated in the co- The numeral 23 designates the valve stem whose 3.40 pending application hereinbefore mentioned, it is upper end passes through a bushing 24 in a boss 95 :not deemed necessary to show the means for 25, centrally located in the head 5 of the standoperating Ythe pilot and main valves which are pipe. Between the bushing 24 and the stem of operated as usual, in that in the construction the valve is a bleeder 26, of suicient size or about to be described herein, and that shown in capacity to form a proper size conduit for' the "45 the pendingv application, the pilot valve is iirst steam to pass freely into the chamber between 100 operated to balance the main valve, and to therethe head of the standpipe and the head of the after operatev itto desired opening and closing main valve. The head of this stem is bifurcated positions relative to the valve seat of the main as indicated at 27, for the reception of cross bar valve, 28 secured to the stem by a pin 29, a connection "J9 Referring to the drawing, the numeral 1 desigwhich is usual and leads to the linkage by means i105 nates a standpipe having its upper end bored out of which the 'main valve and pilot valve are opfor the reception of the main valve 2 mounted for erated. .vertical sliding movement in the upper portion of The upper part of the bushing 19 is provided ythe standpipe or within the chamber 3 formed bewith a valve seat 30 upon which seats the pilot vtween the head 4 of the said main valve, and a valve 31 integral with the valve stem 23. Below l'1110 the pilot valve the stem is reduced in diameter as indicated at 32, thus forming a passageway between the lower portion of the valve cage and the chamber between the valve head and the standpipe head, Below this reduced portion 32, the stem is slightly enlarged as indicated at 33, which enlarged portion slides vertically between the ribs 22 which form guides for said enlarged portion. In the lower end of the valve stern is secured by a threaded shank, a lifting spider 34, adjusted with regard to the lower end of said stem and the lower ends of the central boss of the valve head, to limit the upward movement of the stem in the initial movement of said stem, in opening the pilot valve preliminary to lifting the main valve, to open the ports 15 in the standpipe.

The main valve is provided with annular grooves 35, 35 in which are seated metallic rings 36, the expandible characteristics of which insure a steamtight t between the inner periphery of the standpipe and the main valve.

The turbine casing 7 is provided with numerous vanes 37, suitably spaced apart to form numerous elongatedslots 38 through which the steam first passes in entering the turbine casing. Within the casing and spaced therefrom is an imperforate sleeve 39 extending entirely around the valve, the idea being that the steam in entering the slots between the varies under great pressure, is projected first against this sleeve or baille and the condensates or moisture from the steam accumulating onthe outside of the baille,

drops through the opening 4G and passes into the upper ends of an adequate number of drainage pipes 41, which are provided for the passage of the condensate or separate. After the steam passes into the space between the outer shell of the turbine casing and the baffle plate or sleeve 39, it passes into the conduit 42, between said baille plate and the perforated sleeve or steam drier that guards the ports in the standpipe.

All of the foregoing description is for the purpose of enabling those familiar with the art to comprehend the structure when described, disassociated from any other ofv my patents, or from the structures disclosed in the said copending application. Y,

Now the following relates to the new structure, not involved in any of those mentioned or referred to. In modifying my former-structures, the valvel head is provided withan annular depression 43 in which are arranged an adequate number of internally threadedv circular openings 44for the reception'of seat rings 45, provided at their upper ends with valve seats 46, shaped to conform to the underneath periphery 47 of a corresponding number of check valves 48, formed with stems 49 guided in central sleeves 5,0, supported by short arms 51 integral with the sleeves and with the interior portion of the seat rings. The lower ends of the check valve stems are provided with nuts 52, adjustable on the stems to '53, that are provided between the threaded apervtures for the check valves, thus providing a sort ofaV table for said valves,'the ribs, in AVa sense,

constituting legs by which the table and the central boss, is supported.

Doubtless, the operation of the valve described has become apparent to those skilled in this art, but nevertheless a brief description of the operation will now be made, more particularly for the purpose of accentuating the fact that the check valves in the main valve are provided for the purpose of keeping the valve balanced at all times, either in the opening or closing of the same.

The head 5 of the standpipe, as we have seen, is provided with a bleeder of adequate capacity, open to the steam at all times. When the valve stem 23 is raised, the pilot valve 31 will be opened to permit steam to pass into the lower part of the standpipe, thus relieving the pressure on the valve and bringing about the required balance desired to facilitate opening of the same, the pilot valve in the meantime, cooperating with the peculiar construction of the main valve with relation to varying diameters of the main valve and piston rings as described in my application referred to at the outset.

Upon the initial downward movement, the pilot valve is seated while there is pressure below the valve head. The pressure causes the check valves 48 to be automatically and simultaneously lifted from their seats, relieving the pressure from below the valve and establishing the desired equilibrium.

In the opening of the main valve, pressure below the same will rapidly build up and become greater than the pressure on the top of the valve. The check valves therefore form means for transferring said excess from below the valve to the top thereof, the valves being operated by such excess pressure to establish equilibrium of pressure on both sides of the valve. Similarly, in closing the valve, if pressure below the same is -115 greater than the pressure on the top of the valve, such excess pressure is relieved and transferred from below the valve to the chamber above the same, thus balancing the valve and facilitating the closing movement.

The valve described is of the type wherein the steam is dried or the moisture taken therefrom and returned to the boiler, and this drying is effected by reason of the fact that the steam passes through the slots between the vanes of the turbine casing 7, where it comes in contact with the imperforate sleeve 39 against the outer surface of which the moisture of which the steam 1s denuded, accumulates on said plate and goes back into the boiler through a number of drain pipes 41. The steam then partially dried, passes upward and then downward into the conduit 42 and against the outer face of the perforated sleeve or steam drier 12, where it is further dried before passing through the ports in the standpipe, the moisture of which the steam is denuded at this point, passing back into the boiler, also through the drain pipes 41.

It will be noted that the check valves 48 are arranged radially around the valve stem and '140 equi-distant apart, thus uniformly distributing the pressure over the top and bottom of the main valve as the case may be, in the opening and closing movement of the valve, thus insuring a true vertical movement of the valve, or preventing a sort of a tortional displacement in its operation.

What I claim is:

1. In a locomotive valve, the combination of a standpipe having a cover for the top having an opening in constant communication with a uid 150 source under pressure, ports in said standpipe below the cover and having valve seats at their lower ends, a main valve slidably mounted with relation to said seats, a pilot valve in the main valve extending through the closure of the top of the standpipe and having operative connections extending outside of the standpipe, whereby both the pilot valve and main valve are operated, a check valve carried by the main valve and above the ports in the standpipe and normally subject to a constant pressure through the opening in the cover of the standpipe and adapted to be opened when the pressure below the main Valve exceeds that above said valve for the purpose oi establishing equilibrium between the pressures that occur in the operation of the valve in both opening and closing and on both sides of said main Valve.

2. In a locomotive valve, the combination of a standpipe having a cover for the top having an opening in constant communication with a iuid source under pressure, ports in said standpipe below the cover and having valve seats at their lower ends, a main valve slidably mounted with relation to said seats, a pilot valve in the main valve and extending through the closure of the top of the standppe, and having operative connections extending outside of the standpipe, whereby both the pilot valve and the main valve are operated, a plurality of cheek valves carried by the main valve and adapted to be opened when the pressure below the main valve exceeds that above said valve for the purpose of establishing equilibrium between the pressures that occur in the operation of the valve in both opening and closing and on both sides of, said main valve, said cheek valves being radially arranged around the stern of the main valve and spaced equi-distant apart, whereby the pressure exerted upon the main valve is distributed uniformly on the surface of said valve.

PASQUALE PASCALE. 

